chrome/android/java/res/layout/preference_text_scale.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2014 The Chromium Authors. All rights reserved.
     Use of this source code is governed by a BSD-style license that can be
     found in the LICENSE file. -->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/seekbar_amount"
            style="@style/PreferenceSummary"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:minWidth="40sp" />

        <SeekBar
            android:id="@+id/seekbar"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1" />

    </LinearLayout>

    <TextView
        android:id="@+id/preview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:minHeight="180dp"
        android:layout_marginTop="10dp"
        android:background="#fafafa"
        android:padding="16dp"
        android:text="@string/font_size_preview_text"
        android:textAppearance="@style/TextAppearance.AccessibilityTextPreference"
        android:lineSpacingExtra="6dp" />

</LinearLayout>